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Why run Handler in main Looper thread


Why run Handler in main Looper thread

By : Pavithra Shenoy
Date : November 20 2020, 04:01 AM
Any of those help Handler is not used just to communicate with the main Looper.
Looper is a class that loops over a queue of messages and dispatches them, each instance works with one Thread.
code :
fun onCreate(savedInstanceState: Bundle?) {
    Handler().post {
        // code here is executed after `onCreate` has returned
    }
    // code here is executed before the one posted on the Handler
}


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How to use an handler(created before the looper) in a looper inside thread

How to use an handler(created before the looper) in a looper inside thread


By : Anıl Arslan
Date : March 29 2020, 07:55 AM
Hope this helps hi mate in all tutorial or example the handler used in a looper is created inside the looper example: , The constructor in Handler basically looks like this:
code :
public Handler() {
    ....
    mLooper = Looper.myLooper();
    if (mLooper == null) {
       // throws an exception
    }
    ....
}
Method call for Looper.prepare() and Looper.loop() for main UI thread in android

Method call for Looper.prepare() and Looper.loop() for main UI thread in android


By : Nitin Singh
Date : March 29 2020, 07:55 AM
I wish did fix the issue. In android in case of UI Thread we just create Handler because main UI Thread already have its Looper. , It is in class android.app.ActivityThread in the main method.
What happens if a Handler posts a message to a thread after Looper.prepare() but before Looper.loop() has been called?

What happens if a Handler posts a message to a thread after Looper.prepare() but before Looper.loop() has been called?


By : Jay Carlson
Date : March 29 2020, 07:55 AM
wish helps you Assuming you have invoked Looper.prepare() prior to your useCaseProvider delivering results, you should be fine. If Looper.prepare was not called you should be seeing RuntimeException being thrown.
The Looper object is tied to a thread local which hosts the message queue. The Looper.prepare function will construct this message queue at which point you can begin queuing up messages. Once you fire Looper.loop() that's when those pending messages will begin to execute.
code :
private static final class MyThread extends Thread {
    private Handler mHandler;

    @Override
    public void run() {
        Looper.prepare();

        mHandler = new Handler() {
            @Override
            public void handleMessage(Message msg) {
                // handle message
            }
        };

        Looper.loop();
    }

    public Handler getHandler() {
        return mHandler;
    }
}
Handler h = new Handler(myLooperThread);
When are the default Looper and handler in main thread created

When are the default Looper and handler in main thread created


By : Snorka Snork
Date : March 29 2020, 07:55 AM
wish of those help I'll try my best to explain the basic steps that Android goes through when it starts an application. This is a simplified answer. For more details you probably need to read the Android source code yourself.
Let's start with the user clicking on the launcher icon for your application on the HOME screen. We assume that your application is not currently running:
Can't create handler inside thread Thread[Thread-5,5,main] that has not called Looper.prepare()

Can't create handler inside thread Thread[Thread-5,5,main] that has not called Looper.prepare()


By : wlagrone
Date : March 29 2020, 07:55 AM
should help you out What does the following exception mean; how can I fix it? This is the code: , Inside your onResponse show your dialog like below inside a UI thread
code :
activity.runOnUiThread(new Runnable() {
  public void run() {
  new AlertDialog.Builder(mcontext)
       .setTitle("title:")
       .setMessage(TmpPwd)
       .setPositiveButton("close", new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {
        }
    })
    .show();
  }
});
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